JPH0329657Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] "Industrial application field" This invention relates to a solenoid valve for controlling the opening and closing of an orifice hole, for example, a solenoid valve used for controlling line pressure in a hydraulic circuit of an automatic transmission. It is something.

"Conventional technology" Conventionally, this type of solenoid valve was manufactured in the 1980s, for example.
There is a device disclosed in Japanese Patent No. 8224, in which a yoke 21a integrated with an orifice plate 21 extends so as to surround a bobbin 23 around which a coil 22 is wound, as shown in FIG. An orifice member 25 having a diameter 24 is driven into a hole 27 provided in the orifice plate 21 and having a step 26 . A sleeve 33 is inserted between the core 30 and a stepped portion 39 provided in the center hole 28 of the orifice plate 21 .

Note that a shim 32 is inserted between one end of the sleeve 33 (the upper end in the figure) and the end surface of the core 30 (the lower end in the figure).

34 is a back plate that constitutes a magnetic yoke; 35 is a plunger that is slidably housed inside the sleeve 33; 36 is a spring that always biases the plunger 35 in the direction of closing the orifice hole 24; and 37 is the orifice plate 21. This is the outlet passage for hydraulic oil provided in the

When assembling, the bobbin 23 with the coil 22 wound thereon and the sleeve 33 are placed on the orifice plate 2.
1, the plunger 35 housing the spring 36 is inserted into the sleeve 33, and the shim 32 is placed on the upper end surface of the sleeve 33. The core 30 is tightened and fixed to the orifice plate 21 side through the .

``Problem to be solved by the invention'' However, in the case of such a known solenoid valve, a non-magnetic sleeve that guides the plunger is inserted between the orifice plate and the core, and the core is pressed against it. Because the structure is such that it is assembled by tightening it, if the tightening force becomes excessive during the assembly process, the sleeve may deform, causing sliding failure of the plunger, or the coaxiality of each member may shift, causing the orifice to become distorted. There is a problem that a closing failure occurs.

[Structure of the idea]

``Means for solving the problem'' This invention places a plunger between the valve seat and the core, and uses a compression spring to constantly bias the plunger toward the valve seat, which excites a coil placed outside the plunger. By doing so, the plunger is drawn toward the core side against the force of the compression spring to open the orifice hole provided in the valve seat, and in a solenoid valve where the core is tightened at the cover end, the valve seat surrounds the side of the plunger. The extension part is inserted between the bobbin of the coil and the plunger, and a bearing is arranged inside the extension part of the valve seat to guide the needle part provided at the tip of the plunger, and the extension part is inserted between the coil bobbin and the plunger. A solenoid valve characterized in that a non-magnetic spacer for setting at least the stroke of the plunger is inserted between the extended end and the core, and the core is tightened and fixed at the end of a cover integrally connected to the valve seat. .

"Example" This invention will be described below based on the drawings. FIG. 1 is a diagram showing an embodiment of this invention. First, to explain the structure, reference numeral 1 denotes a magnetic valve seat having an orifice hole 2, and a cylindrical extension 4 extending in the vertical direction is formed around the seat surface 3. The outer diameter is the same and consists of a thick part 4a and a thin part 4b. An oil inlet 6 communicating with the orifice hole 2 is provided at the center of the cover body 5 constituting the yoke portion, and is fixed to the body 8 by screws 7. A reduced diameter portion 4c at the tip of the valve seat 1 is fitted into the oil inlet 6, and the cover body 5 and the valve seat 1 are integrally connected. Reference numeral 9 designates a bearing having a guide hole 10, which is fitted into the inner diameter portion of the thick wall portion 4a, and then a part of the thin bottom of the hole with the bottom in the radial direction of the thick wall portion 4a is deformed to form a surface of the bearing. It is fixed to the valve seat 1 by pressing the handle 9b and caulking 11. 1
2 is a coil wound around a bobbin 13 that fits into the outer periphery of the valve seat 1 and the upper inner periphery of the cover body 5. The bobbin 13 fits into the cover body 16 and the valve seat 1, and is positioned by legs 13a. . Numeral 14 is a magnetic core fitted to the inner periphery of the cover body 5 and the inner periphery of the bobbin 13, and is fixed by caulking the upper edge of the cover body 5. 15 is large diameter part 1
5a and a needle portion 15b. The needle portion 15b is slidably fitted into the guide hole 10 of the bearing 9. As shown in FIG. 2, the bearing 9 is provided with a plurality of axial oil flow passages 9a.

16 is a plurality of oil outlets provided in the extension portion 4 of the valve seat 1; 17 is an annular space 3 formed by the valve seat 1, the cover body 5, and the bobbin 13;
An oil outlet 18 is provided on the circumferential wall of the cover body 5 and communicates with the oil outlet 16 through an oil outlet 18. An oil outlet 18 is an O-ring for sealing interposed between the attachment surface of the cover body 5 and the valve body 8.

A non-magnetic spacer 19 and a non-magnetic shim 20 are interposed between the distal end surface of the extension portion 4 of the valve seat 1 (the upper end surface in the figure and the lower end surface of the core 14. Large diameter portion 15a of plunger 15
A compression spring 29 is compressed between. Reference numeral 31 denotes an electric wire for energizing the coil.

The assembly process of the solenoid valve having the above configuration will be explained as follows.

The bearing 9 is inserted into the valve seat 1 and fixed with caulking 11.

Insert the valve seat 1 made of 1 into the cover body 5.

The bobbin 13 with the coil 12 is fitted into the cover body 5 and the valve seat 1.

The needle portion 15b of the plunger 15 is connected to the bearing 9
Insert into the guide hole 10 of.

A spacer 19 is placed on the upper end surface of the extension of the valve seat 1.

The shim 20 is placed on the upper end surface of the spacer 19.

The core 14 is connected to the shim 20 by inserting the wire 31 through the core 14 and inserting the spring 29.
Place it on top.

Caulk the core side end of the cover body 5 and attach the core 1.
Fix 4.

When assembled in the above order, only the needle portion 15b of the plunger 15 slides within the guide hole 10 of the bearing 9. Since there is a fairly large gap between the circumferential surface of the large diameter portion 15a of the plunger 15 and the inner circumferential surface of the extension portion 4 and the inner circumferential surface of the spacer 19, the core 14 is fixed by caulking. Even if an excessive force is applied and the spacer 19 or the tip of the extension part 4 (thin wall part 4b in this embodiment) is deformed, the large diameter part 15a of the plunger 15 will not be able to maintain the inner peripheral surface of the extension part 4. The plunger 15 does not come into contact with the inner peripheral surface of the spacer 19, and the plunger 15 does not become stuck.

Furthermore, since the bearing 9 is fixed to the thick wall portion 4a of the extension portion 4, the seat surface 3 of the valve seat 1 and the tip surface (the surface facing the seat surface) of the needle portion 15b of the plunger are always parallel. Since the degree and coaxiality are sufficiently maintained, there is no possibility of poor closing performance.

[Effect of idea]

As explained above, according to this idea,
Its structure consists of a plunger placed between the valve seat and the core, a compression spring that constantly biases the plunger toward the valve seat, and a coil placed outside the plunger that is energized to resist the force of the compression spring. In a solenoid valve in which the core is tightened at the end of the cover, the valve seat is extended to surround the side of the plunger, and the extension part 4 is connected to the coil. 12 bobbins 13
A bearing is inserted between the valve seat extension end and the plunger 15, and is arranged inside the extension part of the valve seat to guide the needle part provided at the tip of the plunger, and at least the stroke of the plunger is disposed between the valve seat extension end and the core. The solenoid valve is characterized by inserting a non-magnetic spacer to set the core and tightening it at the end of the cover that is integrally combined with the valve seat to fix the position. Even when force is applied, the plunger sliding part does not deform and the parallelism between the orifice surface and the plunger tip surface does not change, so this is a solenoid valve that operates normally even if excessive tightening force is applied due to process variations. It can be done. Also, if the dimensions of the valve seat 1, bearing 9, and plunger 15 are controlled, the dimensions of the spacer 19 may be constant, and even if the dimensions are loosely controlled, only these three parts can be assembled to ensure that the end face of the extension portion 4 of the valve seat 1 and the plunger 15 are the same. Since it is sufficient to measure the distance between the rear end surfaces, the measurement is simple and the spacers 19 can be easily combined. Therefore, the effect of reducing the cases where excessive tightening force is applied as described above can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of an embodiment of the present invention, Fig. 2 is a sectional view taken along line A-A in Fig. 1, only inside the valve seat portion, and Fig. 3 is a longitudinal sectional view of a conventionally known solenoid valve. It is a diagram. DESCRIPTION OF SYMBOLS 1... Valve seat, 2... Orifice hole, 3... Seat surface, 4... Extension part, 4a... Thick wall part, 4b... Thin wall part, 4c... Reduced diameter part, 5... Cover body, 6... Inlet,
7... Screw, 8... Body, 9... Bearing, 9a... Oil flow passage, 9b... Chamfered portion, 10... Guide hole, 11... Caulking, 12... Coil, 13... Bobbin, 13a... Leg,
14... Core, 15... Plunger, 15a... Large diameter part, 15b... Needle part, 16, 17... Oil outlet,
18...O ring, 19...Spacer, 20...Shim,
21... Orifice plate, 21a... Yoke, 2
2... Coil, 23... Bobbin, 24... Orifice hole, 25... Orifice member, 26... Step part, 27...
Hole, 28... Center hole, 29... Compression spring, 30
...Core, 31...Electric wire, 32...Shim, 33...Sleeve, 34...Back plate, 35...Plunger,
36... Spring, 37... Outlet passage, 38... Annular space, 39... Step portion.

Claims (1)

[Scope of utility model registration request] A plunger 15 is disposed between the valve seat 1 and the core 14, the plunger 15 is always urged toward the valve seat 1 by a compression spring 29, and the coil 12 disposed outside the plunger 15 is energized to activate the plunger 15. compression spring 2
In this solenoid valve, the orifice hole 2 provided in the valve seat 1 is opened by attracting the core 14 side against the force of 9, and the core 14 is tightened at the end of the cover 5. The extension part 4 is inserted between the bobbin 13 of the coil 12 and the plunger 15, and the plunger 15 is inserted inside the extension part 4 of the valve seat 1.
A bearing 9 is provided to guide the needle portion 15b provided at the tip of the valve seat 1 and the core 14.
A non-magnetic spacer 19 that sets at least the stroke of the plunger 15 is inserted between the cores 14 and 14.
A solenoid valve characterized in that the valve seat 1 and the cover 5 are tightened at the end of the cover 5 which is integrally connected to the valve seat 1 to fix the position.